Enhanced Coloration Efficiency for Electrochromic Devices based on Anodized Nb2O5/Electrodeposited MoO3 Binary Systems

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• 作者：David D. Yao ; Rozina A. Rani ; Anthony P. O鈥橫ullane ; Kourosh Kalantar-zadeh ; Jian Zhen Ou
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：May 22, 2014
• 年：2014
• 卷：118
• 期：20
• 页码：10867-10873
• 全文大小：436K
• 年卷期：v.118,no.20(May 22, 2014)
• ISSN：1932-7455

文摘

There is a continuous quest for developing electrochromic (EC) transition metal oxides (TMOs) with increased coloration efficiency. As emerging TMOs, Nb₂O₅ films, even those of ordered anodized nanochannels, have failed to produce the required EC performance for practical applications. This is attributed to limitations presented by its relatively wide bandgap and low capacity for accommodating ions. To overcome such issues, MoO₃ was electrodeposited onto Nb₂O₅ nanochannelled films as homogeneously conformal and stratified 伪-MoO₃ coatings of different thickness. The EC performance of the resultant MoO₃ coated Nb₂O₅ binary system was evaluated. The system exhibited a coloration efficiency of 149.0 cm² C^鈥?, exceeding that of any previous reports on MoO₃ and Nb₂O₅ individually or their compounds. The enhancement was ascribed to a combination of the reduced effective bandgap of the binary system, the increased intercalation probability from the layered 伪-MoO₃ coating, and a high surface-to-volume ratio, while the Nb₂O₅ nanochannelled templates provided stability and low impurity pathways for charge transfer to occur.